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Alex is administrating the firewall in the organization's network. What command will he use to check the ports applications open?
Correct Answer: A
The netstat -an command is used to display all active connections and the TCP and UDP ports on which the computer is listening, without resolving the hostnames. This command provides a list that includes both listening ports and established connections, making it a suitable choice for an administrator like Alex to check the ports that applications have opened on a firewall.